Die stock



July 24, 1934. LILLEBERG 1,967,756

DIE STOCK Filed Jan. 2, 1952 2 sheets-Sheet 1 July 24, 1934 T. M.LILLEBERG DIE STOCK Filed Jan. 2, 1932 2 Sheets-Sheet 2 .ZLZZ 56 Wpatented July 24, 1934 PATENT FFlCE DIE STOCK Tideman M. Lilleberg,

Chicago, 111., assignor to The Nye Tool & Machine Works, Chicago, 111.,a corporation of Illinois Application January 2,

3 Claims.

My invention as to one phase thereof relates to centering devices ofcutting mechanisms for pipes, rods and the like, and more especiallydie-stocks, the centering devices being provided for rotatably engagingthe work, the end of which is to be out, as by a thread-cutting die inthe case of a die stock, positioned beyond the centering device, andmore particularly to centering devices for use in the cutting of work ofdifierent diameters and requiring the adjustment of the centering deviceto the particular size of the work.

One of my objects is to simplify the construction of the centering meansand render them more compact and economical of manufacture.

Another object is to provide a construction of adjustable centeringdevice whereby clogging of the parts thereof, with consequent objection,is minimized; and other objects as will be manifest from the followingdescription.

Referring to the accompanying drawings:

Figure 1 is a face view of a die-stock embodying my improvements, thestock being viewed from the side thereof at which the centering meansare located.

Figure 2 isa view like Fig. 1 with a portion of the cover removed, thisview being taken at the line 2 on Fig. 5 and viewed in the direction ofthe arrow.

Figure 3 is a view in side elevation of the diestock.

ametrically opposed socket portions 8 into which the ends of handlesrepresented at 9 and by which the die-stock is manipulated to thread thework, such'as the pipe shown at 100, are secured.

One face of the body portion 7 at one side of the socket portions 8 isinset as represented and provided at opposite sides of the openingextending through the body portion '7, with ribs 10 and also with lugs12 of much less height than the ribs 10 and diametrically opposed. Theribs 10 and lugs 12 are so disposed as shown as to form a framing inwhich to receive, and confine, a thread-cutting die-block represented at14.

The face of the body portion 7 from which the ribs 10 and lugs 12 extendis also provided with 1932, Serial N0, 584,511

(Cl. Ill-M127) ribs 15 of less height than the ribs 10 and lugs 12, theouter faces 16 of the ribs 15 being milled to lie in the same plane andat a right angle to the longitudinal axis of the opening extendingthrough the body portion '7, these ribs forming seating surfaces for thedie -block 14 and ensuring the positioning of the latter at a rightangle to said axis.

screwing into the body portion '7 at the sockets 8 adjacent the ribs 10are clamp-screws 17, the heads 18 of which, extend inwardly beyond theribs 10 and overlap the outer face of the dieblock 14 these screws, whenscrewed tightly, clamping the die-block against the surfaces 16,

Referring now to the centering means they comprise a circular disklikecentrally apertured portion 19 at the end of the die-stock opposite thatat which the die-block 14 is located, which forms a support for jaws 20shown as in the form of curved bars pivoted at their outer ends ingrouped relation about, and concentrically with, the longitudinal axisof the opening through the body portion 7, to the portion 19, asrepresented at 21.

The jaws 20 which preferably are of the form shown and extend at theirinner ends across said opening to rotatably engage between them the work100 contain arcuate slots 22 into which the inner ends of screws 23carried by a rotatable member 24 and grouped concentrically about saidaxis, extend, whereby upon rotating the member 24 the jaws aresimultaneously moved inwardly toward, or outwardly away from, said axisand at the same speed, depending on the direction of rotation of themember 24, the parts described being preferably so proportioned andarranged as shown that the speed of movement of the jaws will be uniformin moving to any position assuming the member 24 is rotated at a uniformspeed.

The screws 23 screw into threaded openings in the member 24 and theportions thereof which extend into the slots 22 are preferably unthreaded as shown (Fig. 7).

The member 24 which forms an apertured cover for the jaws is shown as inthe form of a centrally apertured disk 25 flatwise opposing the jaws 20and provided with an annular flange 26 telescoping with thecircumferential edge of the disk-portion 19 and having at itscircumferential edge rearwardly extending equidistantly spaced lugs 2''!provided with inturned portions 2'? which lap the rear face of the diskportion 19.

The disk portion 19 at its circumferential edge portion is cut away atequidistant intervals as represented at 28 in order that the portions 27of the lugs 27, in applying the cover 24 to the disk-portion 19, mayclear the edge of the portion 19 to permit the cover to be seated, theportions 27 of the lugs 27, upon rotation of the cover to a position inwhich these portions are out of registration with the cut-away portions28, lapping the disk portion 19 and preventing the cover from separatingfrom the body of the stock, a set screw 29 on the cover and screwingagainst the edge of the disk-portion 19 holding the cover againstrotation thereon.

The screws 23 are assembled with the cover to project into the slots 22after the cover has been interlocked with the disk-portion 19 as stated,the various parts being soproportioned and 31'," ranged that when thescrews 23 are positioned as stated they will engage the ends of theslots 22 in the rotation of the cover in either direction before thelugs 27 move into registration with the cut away portions 28 and thusdanger of accidental separation of the cover from the body of the stockis prevented.

The feature of providing only two spaced apart seats for fiatwiseengagement with the die block is of advantage inasmuch asthe cost ofmanufacturing the structure, as compared with structures having acontinuous seat for the block, is greatly reduced.

The feature of providing the low lugs 12 not only reduces the cost ofconstruction but permits of the conditioning of the retaining meanseither for assembly or disassembly of the die blockwith the stock, byslight rotation only of the clamp-screws 17, it being noted that theseclamp screws need be retracted in a slight degree only to permit the dieblock to be applied to, or removed from, position, the block slidingalong the inner edges of the ribs 10.

The disposition of the milled ribs 15 relative to the low lugs 12 asshown and preferred, viz., at

angles to the latter and thus-in the direction of movement of thedie-block in positioning it in the stock is of advantage as thereby thedie-block may be slid to position without obstruction to its movement.

The cover 24 serves to protect, to a marked degree, the slots in thejaws against entry of dirt and the arrangement of the various parts ofthe centering means as described not only permits the structure to bemade economically but renders it compact in a high degree.

While I have illustrated certain embodiments of my invention I do notwish to be understood as intending to limit the invention thereto as thesame may be variously modified and altered and the invention embodied inother forms of structure without departing from the spirit of myinvention.

What I claim as new, and desire to secure by Letters Patent, is:

1. Centering mechanism comprising a body having a disk-like portioncontaining an aperture, jaws pivoted on said portion, an aperturedmember at the outer-faces of the jaws and rotatable on said diskportion,"said member having lugs lapping said disk portion and holdingsaid member on said disk-portion, said disk-portion having cut-awayportions permitting of the assembly of said'member with saiddisk-portion; means on said member engagingsaid jaws for rocking thelatter upon rotating'said member, and stop means cooperating with saidfirst -named means for pre venting rotation of said member to-a positionin which said lugs register with said cut-away portions.

2. Centering mechanism comprising 'a body having a disk-1ike portioncontaining an aperture, jaws pivoted on said portion and containingslots, an apertured member at the outer faces of thejaws and rotatableon said disk portion, said member having lugs'lapping said diskportionand holding said member on saiddisk-portion, said disk-portionhaving cut-away portions permitting of the assembly of said member withsaid disk-portion,'and pins on said member-and extending into saidslots.

3. Centering mechanism comprising a body 115 portion, jaws pivoted onsaid portion and containing slots, an imperforate annular memberrotatable relative to said body portion and overlying said slots andprojections on said rotatable member extending into said slots forrocking said 120 jaws upon rotation of said member.

TIDEMAN M. LILLEBERG.

